Nice example, demonstrates its best to use a mic when recording a video as the first part sounds unnatural due to the lack of echo, but I doubt the recipient would notice.

Definitely. We recommend keeping the environment as equal as possible when training your voice & recording your videos. So, that goes for room acoustics, voice volume, microphone, etc..

But like you said, at the end of the day, your prospect who watches the video while commuting to work from his phone will never notice. We have a "knowledge bias" as users looking for the manipulations. Glad you like it!